oj.uz

답안 #156371

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
156371 2019-10-05T11:32:56 Z Akashi Potemkin cycle (CEOI15_indcyc) C++14
100 / 100
 440 ms 2552 KB 
#include <bits/stdc++.h>
using namespace std;

int n, m;
bool ad[1005][1005];
bool viz[1005];
int f[1005], TT[1005];
vector <int> v[1005];
vector <int> sol;
queue <int> q;

void find_path(int x, int y){
    q.push(x); viz[y] = 0;
    while(!q.empty()){
        int nod = q.front();
        q.pop();
        for(auto it : v[nod])
            if(!viz[it]) viz[it] = 1, TT[it] = nod, q.push(it);
    }

    while(y != x){
        sol.push_back(y);
        y = TT[y];
    }
    sol.push_back(x);
}

bool find(int nod){
    set <int> nodes;
    q.push(nod);
    while(!q.empty()){
        int nod = q.front();
        q.pop();
        for(auto it : v[nod]){
            if(!f[it]) f[it] = 3, q.push(it);
            if(f[it] == 2) nodes.insert(it);
        }
    }

    for(auto x : nodes){
        for(auto y : nodes){
            if(!ad[x][y] && x != y){
                find_path(x, y);
                return 1;
            }
        }
    }

    return 0;
}

bool solve(int nod){
    f[nod] = 1; viz[nod] = 1;
    for(auto it : v[nod]) viz[it] = 1, f[it] = 2;

    for(int i = 1; i <= n ; ++i) if(!f[i]){
        f[i] = 3;
        if(find(i)) return 1;
    }

    return 0;
}

int main()
{
//    freopen("1.in", "r", stdin);
    scanf("%d%d", &n, &m);

    int x, y;
    for(int i = 1; i <= m ; ++i){
        scanf("%d%d", &x, &y);
        v[x].push_back(y);
        v[y].push_back(x);
        ad[x][y] = ad[y][x] = 1;
    }

    for(int i = 1; i <= n ; ++i){
        sol.push_back(i);
        memset(f, 0, sizeof(f));
        memset(viz, 0, sizeof(viz));
        if(solve(i)) break ;
        sol.pop_back();
    }

    if(sol.size() == 0) printf("no");
    else for(auto it : sol) printf("%d ", it);


    return 0;
}

Compilation message

indcyc.cpp: In function 'int main()':
indcyc.cpp:67:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
indcyc.cpp:71:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 4 ms 504 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 736 KB Output is correct
2 Correct 3 ms 632 KB Output is correct
3 Correct 4 ms 760 KB Output is correct
4 Correct 17 ms 760 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 760 KB Output is correct
2 Correct 16 ms 760 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 1912 KB Output is correct
2 Correct 10 ms 1656 KB Output is correct
3 Correct 257 ms 1916 KB Output is correct
4 Correct 112 ms 1656 KB Output is correct

Subtask #9
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 1656 KB Output is correct
2 Correct 296 ms 1796 KB Output is correct

Subtask #10
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 1784 KB Output is correct
2 Correct 25 ms 1784 KB Output is correct
3 Correct 34 ms 2040 KB Output is correct
4 Correct 440 ms 2552 KB Output is correct